"On 5 gram iodide, I need more selenium. I don't know if that goes for everyone on higher levels of iodide. Of course I have/had Hashimoto's and am/were hypo. Maybe it's because of that that I need more selenium on higher dosages of iodide. It could also be my mercury poisoning: more Iodide dislodges more mercury and mercury binds to selenium, making it unavailable to the rest of the body. But it might also be that higher dosages of Iodide mean you need higher dosages of selenium."